package com.itheima.controller;

import com.itheima.common.R;
import lombok.extern.slf4j.Slf4j;
import org.apache.tomcat.util.http.fileupload.IOUtils;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.UUID;

@Slf4j
/*@RestController
@RequestMapping("/common")*/
public class CommonController {

    @Value("${reggie.path}")
    public String basePath;

    @PostMapping("/upload")
    public R<String> upload(MultipartFile file){
        log.info("file: {}", file.toString());
        String originalFilename = file.getOriginalFilename();
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));
        String name = UUID.randomUUID().toString();

        File file1 = new File(basePath);
        log.info("file1" + file1.toString());
        if (!file1.exists()){
            file1.mkdirs();
        }

        try {
            file.transferTo(new File(basePath + name + suffix));
        } catch (IOException e) {
            e.printStackTrace();
        }
        return R.success(name + suffix);
    }

    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){
        try {
            // 加一个文件存在的判断, 防止出现错误.
            File file = new File(basePath+ name);
            if (!file.exists()){
                return;
            }
            FileInputStream fileInputStream = new FileInputStream(new File(basePath + name));
            ServletOutputStream outputStream = response.getOutputStream();
/*            response.setContentType("image/jpeg");
            int len = 0;
            byte[] bytes = new byte[1024];
            while ((len = fileInputStream.read(bytes)) != -1) {
                outputStream.write(bytes, 0, len);
                outputStream.flush();
            }*/

            //使用IOUtils工具类的copy()进行文件传输.
            IOUtils.copy(fileInputStream, outputStream);
            fileInputStream.close();
            outputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}
